Wow. Did you actually take the time to go to the Museum's website and read about this exhibition? Why, by the way, has artwork from many well regarded artists (like David Hockney for example).
The point of the museum is not to "glorify mastectomies"!!!!! That's just rage bait nonsense on your part. As the museum explains:
We don’t have all the answers, but we’re excited to explore these complex questions together. Whether you’re beginning, continuing, or seeking to understand a gender journey – your own or someone else’s – this exhibition offers a meaningful space for reflection and discovery.
They are providing a learning opportunity for people who wish to understand more about gender, and also why some people are born with bodies that do not reflect their gender and how that feels to have to deal with that very difficult situation.
Perhaps if you feel that people are seeking to "glorify" having breast material removed you would benefit from actually attending the exhibition and taking the time to see things from a variety of different points of view.
In the meantime: policing art of any kind is a slippery slope. Freedom of artistic expression is hugely important and vital to a vibrant and free society where we all benefit from knowing we can express ourselves in our artworks without fear.
If you don't like the exhibit then don't go. If you don't want a double mastectomy then don't get one. But trying to impose your views on gender on other people is as bad as them imposing theirs on you: would you like it if people interfered with your surgical decisions? Of course not. Do you really think people are super happy and stoked to need to go to hospital and have hideously painful and hugely invasive surgery just to feel like their body is correct? Imagine if you were born a woman, but also happened to have an additional penis that of course completely interfered with your ability to properly identify as the sex you identified with? Wouldn't you want to be able to have that appendage removed/altered without being called horrific names and being demonised for doing so? What would it mean if you were prohibited from having that surgery?? The point of this exhibition is to allow people to have those conversations in a safe place. And to learn about people who have had to confront those kinds of massive decisions themselves and to understand why they made the decisions they made. These people exist: they are real, and their experiences are as valid as yours are.